【Series Overview】 This is a complete set of 10 books from the "Why? Series" and the "Experiment Showdown Series." The series covers themes related to science, nature, and the human body, stimulating children's curiosity. 【Learning Content】 Each volume explains scientific principles and natural phenomena in an easy-to-understand manner. Children can learn through experiments and quizzes in an enjoyable way. 【Target Age】 Designed for elementary school students, it is ideal for home study and as a supplementary educational material in schools. - Series Name: Why? Series - Number of Books: 10 books in total - Content: Learning about science, nature, the human body, etc. - ISBN Code: 978-4-09-227300-5 (Example) - Volume Numbers: Volumes 1-9 - Series Name: Experiment Showdown Series - Themes: Showdown of Forces, Earth, Human Body, etc. Thank you for viewing.